Description

Size upto 20 mm with 3 flutes and 20mm to 75 mm with 4 flutes. Above 75 mm will be supplied with 6 Flutes.Three-flute core drills have more chip clearing than four-flute core drills.
They are used for deep holes and for holes requiring substantial enlarging.
Four-flute core drills have a better surface finish than three-flute core drills and can be run at higher metal removal rates.
They are used for holes requiring light to medium enlarging. Most users find them easier to resharpen and measure.